ios - MapBox:如何删除一个形状并绘制另一个形状？

Question

我为形状创建了注释

    _path = [RMAnnotation annotationWithMapView:_mapView
                                         coordinate: _userLocation.coordinate
                                           andTitle:@"Path"];
     [_mapView addAnnotation:_path];

在委托(delegate)中我写了

- (RMMapLayer *)mapView:(RMMapView *)mapView layerForAnnotation:(RMAnnotation *)annotation
{
    if ([annotation.title isEqualToString:@"Path"])
    {
        _lineBetweenTwoBeacon = [[RMShape alloc] initWithView:mapView];
        _lineBetweenTwoBeacon.lineColor = [UIColor redColor];
        _lineBetweenTwoBeacon.lineWidth =  10.0f;
        return _lineBetweenTwoBeacon;
    }
    else
    {
    marker = [[RMMarker alloc] initWithUIImage:[UIImage imageNamed:@"userPin"]];
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 80, 80)];
    imageView.contentMode = UIViewContentModeScaleAspectFit;
    marker.leftCalloutAccessoryView = imageView;
    return marker;
    }
}

下一步我画形状

[_lineBetweenTwoBeacon addQuadCurveToCoordinate:firstBeaconCoord controlCoordinate:secondBeaconCoord];

但是如何从 map 中删除所有形状并添加新形状。现在形形色色，这是不正确的。如果_lineBetweenTwoBeacon 每次都重绘会更好。

谢谢你的帮助!

Answer 1

当您手动创建一个 RMShape 时，您需要在创建它之后使用 -moveToCoordinate: 和 -addLineToCoordinate 等方法告诉它移动和绘制的位置:。如果您只有基本需求，我建议您尝试 RMPolylineAnnotation，它会为您处理绘图。